Circuit arrangement for wireless signaling



Patented Oct. 6, 1925.

UNITED STATES rasant PATENT oFFIcs.

OTTO SCHRIEV'ER, OF BERLIN, GERMANY, SSIGNO-TO GESELLSCHBJT FR DRAHT- LGSE TELEGRAPHIE lVL B; H. HALLESCHES, F BERLIN, GERMANY, A. CORPGRA.-

TI 0N OF GERMANY.

CIRCUIT ARRANGEMENT FOR WIRELESS SIGNAIJNG.

Application led December 27, 1922. lSerial No. 609,214.

To aZZ 'Lv/wm it may concern.

Be it known that I, O'r'ro Soninnvnn, a citizen of the Republic of Germany, and a resident of Hallesches Ufer 12/13, Berlin,

S. W. l1, Germany, have invented new and useful Improvements in Circuit Arrangements for Wireless Signaling, of which the following is a specification accompanied by drawings.

The resent invention relates to the neutralization of the coupling between individual elements of a plurality of wireless senders working side by side. In accordance with the invention, the coupling between the two sender systems is not entirely neutralized because this would often necessitate the pro vision of complicated and bulky arrangements. It has been found that in the practical operation of wireless telegraph apparatus it is often sufficient if the coupling is neutralized only in individual parts of the sender arrangements, and this is true particularly in case the coupling between the senders has in itself no harmful effects, e. g'. in the case of a coupling which does not reduce the radiation of the antennae, but has the disadvantage that the respective senders cannot be adjusted independently of each other because the ammeter or the energy generating element of each of the arrangements is aifected by the currents in both arrangements.

An embodiment of the invention will be hereinafter set forth, first as applied to the usual wireless telegraph arrangement in which two antennae, which are provided on one and the same or on two towers located near each other, operate simultaneously and are closely coupled with each other. In accordance with prior inventions the coupling between the two antennae may be entirely neutralized so that neither of the antennae Y will be affected by current from the other antenna. I-Iowever, for this purpose it is necessary that the extension self-induction coils of the two antennae be physically \\br,o ught near each other. If the waves or the two antennae are not very near each other, 'the reduction of the radiation of one an- ,50 tenna caused by the presence of the other an- EN .r

However, in view of the fact that the antenna is tuned in accordance with the am- 'f meter, it has heretofore been necessary to neutralize, so far as practicable, the coupling between the antennaeL because otherwise the ammeter of each antenna always indicated the currents of both senders.

In the drawing- Fig. l is a diagrammatic representation of a portion of a circuit arrangement embodying the invention, and

Fig'. 2 is a diagrammatic representation of a more complete circuit arrangement which also embodies the invention.

In accordance with one use of the present invention only the ammeters are uncoupled. This is illustrated in Fig. l. The coil L1 of the sender S1 receives induction from the sender S2 and compensates thereby in the ammeter J1 the current that iows from the sender S2 in the antenna S1. The antenna 75 S1 may therefore be adjusted exclusively to the current in its own circuit.

As a further exemplification of the present invention, Fig. 2 illustrates an application of the invention to a tube sender. In this figure, the grid and anode of the tube R are coupled with the coil L1. If the coupling between the two antennae shown in Fig.

2 is not neutralized, then current will be received from the second sender in the anode 35 and the grid of the tube R, and the proper operation of the tube sender will be prevented. y

In accordance with the present invention, the coil L1 is connected in parallel with a 90 coil L2 to which the sender'S2 supplies potential in such a manner that the coil L]L is free from all currents except those of the operating frequency of the generating tube R. As indicated in Fig. 2 of the drawing, the am- 95 meter J1 of the sender S1 may be located in the circuit of the sender S1 in such a manner that the coil L2 is connected in parallel with the animeter J1 as well as with the coil L1.

Having described my invention, what I claim is:

1. A. circuit arrangement comprising two senders having their antennae electrostatically coupled, and arranged to operate simultaneously, and means for neutralizing the effect of the coupling between the antennae with respect to a part only of one of the senders, said means comprising a. circuit connected in parallel with said part and coupled with the other sender so as to receive compensating potential therefrom.

2. A circuit arrangement comprising two senders having their antennae electrostatically coupled, and arranged to operate simultaneously, apparatus and also an ammeter connected in circuit with one of the senders, and means for neutralizing the effect of the coupling between the antennae with respect to a part of said apparatus and said ammeter only, said means comprising a circuit connected in parallel with the said part and ammeter and coupled with the other sender.

3. A circuit arrangement comprising two senders' having their antennae electrostatically coupled, and arranged to operate simultaneously, one of said senders comprising an energy generator including a three-electrode vacuum tube, a coil in the anode circuit of the tube and a grid circuit regeneratively coupled with said coil, and means for neutralizing the eect of the coupling between the antennae with respect to said energy generator, said means comprising a circuit connected in parallel with the coil in the anode circuit of the generator and being coupled with the other sender so as to receive compensating potential therefrom and transmit it to the first-mentioned sender.

ll. A circuit arrangement comprising two senders having their antennae electrostatically coupled, and arranged to operate simultaneously, apparatus and also a generator connected in circuit with one of the senders, and means for neutralizing the effect of the coupling between the antennae with respect to a part of said apparatus and said generator only, said means comprising a circuit connected in parallel with said part and generator and coupled to the other sender.

5. A circuit arrangement comprising two senders having their antennae electrostatically coupled, and arranged to operate simultaneously, and means for neutralizing the effect of the coupling between the antennae with respect to a part only of one of the senders, said means comprising a circuit connected in parallel with said part and including a coil coupled with a coil on the other sender so as to transmit compensating potential from the last-mentioned sender to said part.

6. In combination, a plurality of circuits 8. In combination, a plurality of circuits having portions thereof coupled together, one of said circuits having a bart which it is desired to keep free from the disturbing influence of the coupling with another of said circuits, said part having a neutralizing circuit connected across it and coupled with said disturbing circuit.

9. A circuit arrangement comprising two senders arranged to operate simultaneously with their antennae electrostatically coupled together, the first sender having apparatus and a parallel circuit in series with its antenna, one branch of said parallel circuit containing an ammeter and generator and the other branch containing a neutralizing coil, said coil being coupled to the second sender so that the effect of the energy generated by said second sender on said amineter and generator is nil.

10 A circuit arrangement comprising two 85 senders having their antennae electrostatically coupled and arranged to operate simultaneously, and means for neutralizing the effect of the coupling between the antennae with respect to a part only of one of the senders, said means comprising a circuit connected in parallel with said part and coupled with the other sender so as to receive compensating potential therefrom, said part including a measuring instrument.

l1. A circuit arrangement comprising two senders having their antennae electrosta 1- cally coupled, and arrzigel'tperate simult taneously, and means for neutralizing the eil'ect of the coupling between the antennae' 100 with respect to a part only ofone of the senders, said means comprising a circuit connected in parallel with said part and coupled with the other sender so as to receive compensating potential therefrom, said part in- 105 cluding a thermionic tube generator.

OTTO SCHRIEVER. 

